Add a caddy http directive to serve a web ui for admin api.

Build caddy with this package

xcaddy build --with github.com/gsmlg-dev/caddy-admin-ui@main

Add a http config

{
        admin localhost:2021
}

:2022 {
    route {
        caddy_admin_ui
        reverse_proxy localhost:2021 {
            header_up Host localhost:2021
        }
    }
}

• Show Server Config
• Show Upstream
• Show PKI
• Load Server Config and Save Config to Server
• View Metrics from "/metrics"